/** Copyright 2013-2020 the original author or authors from the JHipster project.
 *
 * This file is part of the JHipster project, see http://www.jhipster.tech/
 * for more information.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

const Rules = require('./rules');
const FieldIssue = require('./issues/field-issue');

let issues;

module.exports = {
    checkFields,
};

/**
 * Check fields for lint issues.
 * That is done by passing the list of fields declarations from the CST (from the JDLReader output).
 * @param {string} entityName - the name of the entity having the fields
 * @param {Array} fieldDeclarations - the field declaration list
 * @return {Array} the found entity issues.
 */
function checkFields(entityName, fieldDeclarations) {
    if (fieldDeclarations.length === 0) {
        return [];
    }
    issues = [];
    checkForDuplicatedFields(entityName, fieldDeclarations);
    return issues;
}

function checkForDuplicatedFields(entityName, fieldDeclarations) {
    const fieldNames = new Set();
    const duplicatedFieldIssues = new Map(); // key: fieldName, value: issue
    fieldDeclarations.forEach(fieldDeclaration => {
        const fieldName = fieldDeclaration.children.NAME[0].image;
        if (fieldNames.has(fieldName)) {
            if (!duplicatedFieldIssues.has(fieldName)) {
                duplicatedFieldIssues.set(
                    fieldName,
                    new FieldIssue({
                        ruleName: Rules.RuleNames.FLD_DUPLICATED,
                        fieldName,
                        entityName,
                    })
                );
            }
        } else {
            fieldNames.add(fieldName);
        }
    });
    duplicatedFieldIssues.forEach(issue => {
        issues.push(issue);
    });
}
